Determining online system user eligibility for receiving content using a polygon representing a physical location associated with the content

ABSTRACT

An online system determines a polygon representing a physical location associated with a content item and indexes edges of the polygon based on their positions along an axis of a map. The index is used to retrieve edges spanning a point on the axis representing a location of a client device associated with an online system user. The online system compares the positions of the point and retrieved edges on an axis perpendicular to the axis and determines whether the user is at the physical location based on the comparison. If the user is not at the physical location, a boundary surrounding the point is compared with boundaries surrounding the indexed edges to determine whether the user is within a threshold distance of the physical location. If the user is at or within the threshold distance of the physical location, the user is determined eligible to receive the content item.

BACKGROUND

This disclosure relates generally to online systems, and morespecifically to presenting content to users of an online system.

Online systems, such as social networking systems, allow online systemusers to connect to and to communicate with other online system users.Users may create profiles on an online system that are tied to theiridentities and include information about the users, such as interestsand demographic information. The users may be individuals or entitiessuch as corporations or charities. Online systems allow users to easilycommunicate and to share content with other users by providing contentitems to an online system for presentation to the other users. Contentitems provided to an online system by a user may include declarativeinformation about the user, status updates, check-ins to locations,images, photographs, videos, text data, or any other information theuser wishes to share with additional users of the online system. Anonline system may also generate content items for presentation to auser, such as content items describing actions taken by other users onthe online system.

Many online systems allow users (e.g., businesses) to sponsorpresentation of content on an online system to gain public attention fora user's products or services or to persuade other users to take anaction regarding the user's products or services. Content for which anonline system receives compensation in exchange for presenting to usersis referred to as “sponsored content.” Additionally, many online systemsreceive compensation from a user for presenting online system users withcertain types of sponsored content provided by the user. Frequently,online systems charge a user for each presentation of a sponsoredcontent item to an online system user or for each interaction with asponsored content item by an online system user. For example, an onlinesystem receives compensation from an entity each time a content itemprovided by the user is displayed to another user on the online systemor each time another user is presented with a content item on the onlinesystem and interacts with the content item (e.g., selects a linkincluded in the content item), or each time another user performsanother action after being presented with the content item (e.g., visitsa physical location associated with the user who provided the contentitem).

Online systems often apply criteria associated with content items uponidentifying an opportunity to present content to a user of an onlinesystem to identify online system users who are most likely to beinterested in being presented with the content items. Such “targeting”criteria are often specified to an online system by a user that submitsa content item to the online system for presentation to other users.Targeting criteria allow the online system to identify users eligible tobe presented with a content item based on characteristics associatedwith the users. For example, content items associated with a particularrestaurant may be associated with targeting criteria describing userswho have indicated an interest in the restaurant by frequently checkingin to the same or a similar restaurant via the online system, userswhose profile information on the online system includes dining out as aninterest or hobby, and users who have indicated a preference for a pageabout the restaurant on the online system. Hence, targeting criteriaallow an online system to identify users who are most likely to beinterested in being presented with a particular content item as eligibleto receive the content item.

Some content items presented by an online system are naturally morerelevant to certain users than to other users based on physicallocations associated with the content items and the users. For example,content items describing a museum having a physical location in aparticular city are more likely to be relevant to users who are visitingthe physical location or an area near the physical location than tousers who are in a distant area of the city or who are in a differentcity. As such, targeting criteria associated with content items providedto an online system often include information describing physicallocations associated with the content items and a distance relative tothe physical locations for identifying users eligible to be presentedwith the content items by the online system. For example, targetingcriteria associated with content items describing the museum of theprevious example may specify online system users determined to have acurrent or recent physical location at or within a specified distance ofthe museum are eligible to receive the content items. An online systemmay apply such targeting criteria by determining a location of a clientdevice associated with an online system user and comparing the locationof the client device with a physical location associated with a contentitem. If the client device is determined to be at or within a specifieddistance from the physical location described by targeting criteria, theonline system may determine the user is eligible to receive the contentitem and present the user with the content item.

However, online systems that apply targeting criteria describingphysical locations associated with content items are often required toperform complex, resource-intensive operations on large amounts of datain short periods of time to extract, analyze and process informationnecessary to determine locations of users relative to the physicallocations. These operations must be performed in addition to operationsrequired to identify content items likely to be of interest to a userbased on the user's determined location when the online systemidentifies an opportunity to present content to the user. For example,an online system must receive information describing a geographiclocation of a client device associated with a user and quickly andaccurately analyze the user's location relative to various physicallocations associated with various content items to determine whether theuser is at or within a threshold distance of any particular physicallocation. If the user is determined to be at or within a thresholddistance of a physical location associated with a content item, theonline system must then identify the content item as a candidate contentitem eligible to be provided to the user based on the user's location.The candidate content item may then be included in a content selectionprocess which requires additional processing time in order to selectcontent items that will be presented to the user.

Failure to perform these operations in a quick and efficient manner mayresult in user dissatisfaction and alienation. For example, a user maybe within a threshold distance of several physical locations associatedwith various content items for only a short period of time as the usertravels through a neighborhood including the physical locations. If theuser is not within a threshold distance of a particular physicallocation associated with a content item when a request for content fromthe user is received but is at the physical location when the operationsare completed, the online system may determine the user is not eligibleto receive the content item despite the user's likely interest in thecontent item. Similarly, the time required to perform the operations maycause an online system to determine a user is eligible to be presentedwith a content item only after the user is far from a physical locationassociated with the content item and therefore likely to be lessinterested in the content item. Hence, conventional application oftargeting criteria describing physical locations associated with contentitems may cause an online system to determine users who would likely beinterested in the content items are not eligible to receive the contentitems and users who would likely not be interested in the content itemsare eligible to receive the content items, resulting in missedopportunities to present users with meaningful content and subsequentuser dissatisfaction and loss of user engagement with the online system.As such, there is a need for improvements that would allow an onlinesystem to determine an online system user's location relative to aphysical location associated with content presented by the online systemin a more quick and efficient manner.

SUMMARY

An online system determines an online system user is eligible to bepresented with a content item associated with a physical location whenthe user is at or within a specified distance of the physical locationbased on stored information describing a polygonal representation of thephysical location on a map and received information describing ageographic location of a client device associated with the user. In someembodiments, the content item is a sponsored content item for which theonline system receives compensation in exchange for presenting to auser, while in other embodiments, the content item is an organic contentitem for which the online system does not receive compensation inexchange for presenting to the user. For example, the content item is alocation check-in, a post, a status update, an image, an audio file, avideo file, an article, or any other type of content associated with aphysical location and received from a publishing user of the onlinesystem for presentation by the online system. In various embodiments,targeting criteria received along with the content item includesinformation describing a physical location associated with the contentitem and specifies users determined by the online system to be at orwithin a specified distance of the physical location are eligible toreceive the content item. For example, the online system receives anarticle describing a restaurant from an owner of the restaurant alongwith targeting criteria requesting the online system to present thearticle to online system users determined to be visiting a physicallocation of the restaurant or who are visiting a physical locationwithin 50 meters of the restaurant.

If the online system receives targeting criteria describing a physicallocation associated with a content item, the online system identifies aposition of the physical location on a geographic map and determines apolygon having a plurality of edges bounding a representation of thephysical location on the map. For example, the online system identifiesa plurality of map coordinates representing a position of each corner ofa building on a map and traces a polygon on the map having vertices atthe identified map coordinates. In various embodiments, the position,size and shape of the polygon represent the position, size and shape ofthe physical location on the map such that each edge of the polygoncorresponds to a wall or other boundary enclosing an area of thephysical location on the map. For example, if the physical location is acoffee shop having a rectangular building and an adjacent circularoutdoor seating area, the online system determines a polygon havingthree edges joined at right angles forming three sides of therectangular building and multiple edges joined at obtuse angles formingthe circular seating area adjacent to the building. Hence, the polygonmay have an irregular shape defined by multiple edges having differentdimensions.

For each polygon determined by the online system, the online systemdetermines edge data describing a position of each edge of the polygonon the map and generates an index for each edge based on the determinededge data. In various embodiments, edge data determined by the onlinesystem comprises a plurality of edge coordinates associated with eachedge. For example, edge coordinates associated with an edge are gridcoordinates which represent a position and size of each edge on the map.Hence, in various embodiments, the online system determines edge datadescribing a position of each edge of the polygon on the map bydetermining a plurality of edge coordinates that each identifies aposition of a point of an edge on the map relative to one or more fixedaxes of the map. Example edge coordinates which comprise the edge datadetermined by the online system include latitude coordinates, longitudecoordinates, y-coordinates, x-coordinates, and any other gridcoordinates determined by the online system suitable for identifying aposition of a point on a map relative to one or more fixed axes of themap.

Based on the determined edge coordinates associated with each edge ofthe polygon, the online system generates an edge index for each edge andstores the edge index along with the edge data and an identifierassociated with the polygon in an edge data store of the online system.In various embodiments, an edge index generated for an edge comprises aset of edge coordinates representing a position of each endpoint of theedge along a specified axis of the map, such as a vertical axis or ahorizontal axis. For example, the online system generates an edge indexfor an edge comprising latitudinal coordinates identifying a position ofeach endpoint of the edge on a vertical axis of the map, allowing theonline system to store information describing a vertical area of the mapoccupied by the edge's height on the map (e.g., a vertical footprint ofthe edge on the map). As another example, the online system generates anedge index for an edge comprising longitudinal coordinates identifying aposition of each endpoint of the edge on a horizontal axis of the map,allowing the online system to store information describing a horizontalarea of the map occupied by the edge's length on the map. The edge indexis stored in the edge data store with the edge data and an identifier ofthe polygon formed by the edge, in various embodiments.

In some embodiments, the online system also determines an edge boundarysurrounding each edge of the polygon on the map and stores informationdescribing the edge boundary in the edge data store along with the edgedata, edge index and polygon identifier. While an edge index describes aposition and dimension of an edge along a vertical or horizontal axis ofthe map, an edge boundary describes a position and dimension of the edgealong a vertical and horizontal axis of the map, in some embodiments. Invarious embodiments, the online system determines a geometric boundarycircumscribing each edge of the polygon on the map and stores a set ofedge boundary coordinates identifying multiple points on the mapcomprising an edge boundary. For example, a set of edge boundarycoordinates identifying a position of each corner of a rectanglecircumscribing an edge of the polygon on the map is stored in the edgedata store along with the determined edge data, edge indexes and polygonidentifier associated with the polygon. In the previous example, alength of a horizontal dimension of the edge boundary corresponds to alength of the edge along a horizontal axis of the map and a height of avertical dimension of the edge boundary corresponds to a height of theedge along a vertical axis of the map. As another example, the onlinesystem determines and stores a set of edge boundary coordinatesidentifying an area of a circle circumscribing an edge of the polygon onthe map. Hence, the online system determines edge data describing aposition of each edge of the polygon on the map and uses the edge datato generate edge indexes describing a position of each edge of thepolygon along a vertical or horizontal axis of the map and to determineedge boundaries surrounding each edge along a vertical and horizontalaxis of the map.

To determine whether an online system user is at or within a thresholddistance of the physical location associated with the content item, theonline system determines a geographic location associated with the userbased on received information describing a geographic location of aclient device associated with the user. For example, the online systemreceives location information describing a geographic location of aclient device (e.g., a street address, a location identifier, geographiccoordinates, etc.) along with information identifying a user associatedwith the client device to the online system, allowing the online systemto associate the location of the client device with the user. In someembodiments, a client device communicates location information to theonline system when a user of the client device requests to share alocation with the online system. A client device may also communicatelocation information to the online system when the client device iswithin at least a threshold distance from a particular physical locationor at various predetermined time intervals. For example, the onlinesystem receives location information from a client device when a userchecks-in to a physical location via the client device or via anapplication executing on the client device. As another example, theonline system receives location information from a client device or froman application executing on the client device when the client device iswithin a threshold distance of certain devices for connecting to anetwork (e.g., wireless access points or cellular phone towers).

Based on the received location information, the online system identifiesa position of the geographic location on the map and determines alocation point associated with the position. For example, the onlinesystem determines a set of location coordinates identifying a positionof the geographic location on the map and determines a location pointbased on the set of location coordinates. A location point identifies aposition of the geographic location on the specified axis of the map.For example, if the received location information includes a set ofgeographic coordinates identifying a latitude and longitude of thegeographic location and the specified axis of the map is a verticalaxis, the online system determines the location point is the latitudecoordinate. As another example, if the online system has generated edgeindexes representing a position of each endpoint of an edge of thepolygon along a longitudinal axis of the map, the location pointidentifies a position of the geographic location on the longitudinalaxis of the map. The location point may be a latitude coordinate, alongitude coordinate, an x-coordinate, a y-coordinate, or any other gridcoordinate determined by the online system suitable for identifying aposition of a point on a map relative to one or more fixed axes of themap.

To determine whether the client device is at the physical location, theonline system retrieves a set of edges that span the location pointalong the specified axis of the map. An edge spans the location pointalong the specified axis of the map if a point of the edge has aposition on the specified axis of the map represented by the locationpoint. Additionally, an edge spans the location point along thespecified axis of the map if the edge has an endpoint on both sides ofthe position represented by the location point on the specified axis ofthe map. For example, if the specified axis of the map is a verticalaxis, an edge having endpoints above and below the position identifiedby the location point on the vertical axis of the map spans the locationpoint along the specified axis of the map. Similarly, if the specifiedaxis of the map is a horizontal axis, an edge having endpoints to theleft and right of the position identified by the location point on thehorizontal axis of the map spans the location point along the specifiedaxis of the map.

In various embodiments, the online system queries the edge data storeusing a set of indexed edge coordinates to retrieve the set of edgesthat span the location point along the specified axis of the map. Forexample, the online system submits a query to the edge data store thatspecifies a coordinate representing a position on the specified axis ofthe map matching the position of the location point and requests a setof edges that span the location point along the specified axis. Inresponse to the query, edges associated with a set of indexed edgecoordinates representing a position of each endpoint of the edge onopposite sides of the location point along the specified axis of the mapare returned. For example, if the location point identifies a positionon the map at latitude 37.4530° N, the online system retrieves a set ofedges having an endpoint above and below latitude 37.4530° N.

In some embodiments, the set of edges retrieved by the online system mayinclude edges of different polygons. For example, if the online systemreceives targeting criteria associated with content items associatedwith different physical locations and determines a polygon representingeach physical location, the edge data and edge indexes stored by theonline system include edge coordinates associated with each polygon andthe retrieved set of edges includes edges of one or more of each polygonthat span the location point along the specified axis of the map. Invarious embodiments, the online system identifies a polygon associatedwith each edge included in the set of edges based on a polygonidentifier stored with the edge data associated with each edge. Hence,the set of edges spanning the location point may include one or moreedges of different polygons.

The online system compares a position of the geographic location and aposition of each edge of the set of edges on an additional axis of themap perpendicular to the specified axis and computes a value associatedwith the set of edges based on the comparison. In various embodiments,the online system performs the comparison by tracing a ray from theposition of the geographic location on the map along an axis of the mapperpendicular to the specified axis and computes a number of edges ofthe set of edges intersected by the ray. If the set of edges includesedges of different polygons, the online system computes a number ofedges of each polygon included in the set of edges intersected by theray. For example, the online system computes a number of edgesassociated with each of one or more polygon identifiers associated withthe set of edges intersected by the ray. Based on the computed value,the online system determines whether the client device is within an areaof the map represented by the polygon and therefore at the physicallocation.

In various embodiments, the online system determines the client deviceis at the physical location if the computed value indicates an oddnumber of edges of the polygon are intersected by a ray from a positionof the geographic location on the map along the additional axisperpendicular to the specified axis. If the computed value is associatedwith a set of edges including edges of more than one polygon, the onlinesystem determines the client device is at a physical locationrepresented by a particular polygon if the value indicates an odd numberof edges of the particular polygon are intersected by the ray. Forexample, the online system identifies a particular polygon having an oddnumber of edges intersected by the ray based on a polygon identifierassociated with the odd number of edges. If the client device isdetermined to be at the physical location represented by the polygon,the online system determines the user associated with the client deviceis eligible to be presented with a content item associated with thephysical location and provides the content item to the client device forpresentation to the user, in some embodiments. For example, the onlinesystem identifies and retrieves a stored content item associated withthe physical location and communicates the content item to the clientdevice for presentation to the user.

In various embodiments, the online system determines the client deviceis not at the physical location represented by the polygon if the valueassociated with the set of edges indicates no edges or an even number ofedges of the set of edges is intersected by a ray from a position of thegeographic location on the map along the additional axis perpendicularto the specified axis. If the computed value is associated with a set ofedges including edges of more than one polygon, the online systemdetermines the client device is not at a physical location representedby a particular polygon if the value indicates no edges or an evennumber of edges of the particular polygon are intersected by the ray.For example, the online system identifies a particular polygon having aneven number of edges intersected by the ray based on a polygonidentifier associated with the even number of edges. If the onlinesystem determines the client device is not at the physical locationrepresented by a polygon, the online system determines whether theclient device is within at least a threshold distance of the physicallocation. For example, the threshold distance is a specified radiusaround the physical location provided by a publishing user who submittedtargeting criteria associated with the content item to the onlinesystem. The online system determines whether the client device is withinat least the threshold distance of the physical location based onproximity of a representation of the geographic location of the clientdevice on the map to an edge of the polygon on the map.

To determine whether the geographic location of the client device iswithin at least the threshold distance of the physical location, theonline system determines a location boundary having a radius around arepresentation of the geographic location on the map corresponding tothe threshold distance. In various embodiments, the online systemdetermines a set of location boundary coordinates identifying multiplepoints on the map comprising the location boundary having the specifiedradius around the geographic location on the map. For example, iftargeting criteria specifies a radius of 50 meters around the physicallocation, the online system determines a location boundary including ageographic area having a radius of 50 meters around a representation ofthe geographic location on the map and determines a set of locationboundary coordinates identifying a perimeter of a circle comprising thelocation boundary on the map. The online system retrieves informationfrom the edge data store describing an edge boundary surrounding eachedge of the polygon on the map and determines whether the locationboundary intersects at least one edge boundary.

In various embodiments, the online system determines the locationboundary intersects an edge boundary if a set of location boundarycoordinates identify a position on the map also identified by a set ofedge boundary coordinates. For example, if both the location boundaryand an edge boundary include a position on the map identified by thesame x,y coordinate, the online system determines the location boundaryintersects the edge boundary. If the online system determines thelocation boundary intersects an edge boundary, the online systemdetermines the geographic location of the client device is within atleast the threshold distance of the physical location associated withthe content item. If the geographic location of the client device isdetermined to be within the threshold distance of the physical location,the online system determines the user associated with the client deviceis visiting an area within the threshold distance of the physicallocation and is therefore eligible to be presented with a content itemassociated with the physical location. In various embodiments, theonline system retrieves the content item associated with the physicallocation and provides the content item to the client device forpresentation to the user.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a system environment in which an onlinesystem operates, in accordance with an embodiment.

FIG. 2 is a block diagram of an online system, in accordance with anembodiment.

FIG. 3 is a flow chart of a method for determining eligibility of anonline system user for receiving a content item associated with aphysical location using a polygonal representation of the physicallocation, in accordance with an embodiment.

FIG. 4 is an example position of a physical location associated with acontent item on a map and a polygon representing the physical locationon the map, in accordance with an embodiment.

FIG. 5A is an example of indexed edge coordinates describing a positionof each endpoint of each edge of a polygon representing a physicallocation along a specified axis of a map, in accordance with anembodiment.

FIG. 5B is an example of edge boundaries surrounding edges of a polygonrepresenting a physical location on a map, in accordance with anembodiment.

FIG. 6 is an example edge data table including edge data, edge indexes,and edge boundaries stored in an edge data store of the online system,in accordance with an embodiment.

FIG. 7A is an example position of a geographic location of a clientdevice associated with an online system user on a map and a locationpoint identifying a position of the geographic location on a specifiedaxis of the map, in accordance with an embodiment.

FIG. 7B is an additional example position of a geographic location of aclient device associated with an online system user on a map and alocation point identifying a position of the geographic location on aspecified axis of the map, in accordance with an embodiment.

FIG. 8A is an example set of edges of a polygon representing a physicallocation that span a location point along a specified axis of a map, inaccordance with an embodiment.

FIG. 8B is an additional example set of edges of a polygon representinga physical location that span a location point along a specified axis ofa map, in accordance with an embodiment.

FIG. 9A is an example of a ray from a position of a location point on amap along an axis of the map perpendicular to a specified axis of themap, in accordance with an embodiment.

FIG. 9B is an additional example of a ray from a position of a locationpoint on a map along an axis of the map perpendicular to a specifiedaxis of the map, in accordance with an embodiment.

FIG. 10A is an example location boundary surrounding a position of ageographic location of a client device associated with an online systemuser on a map, in accordance with an embodiment.

FIG. 10B is an example comparison of a position of a location boundarysurrounding a position of a geographic location of a client deviceassociated with an online system user on a map and edge boundariessurrounding edges of a polygon representing a physical location on themap, in accordance with an embodiment.

The figures depict various embodiments for purposes of illustrationonly. One skilled in the art will readily recognize from the followingdiscussion that alternative embodiments of the structures and methodsillustrated herein may be employed without departing from the principlesdescribed herein.

DETAILED DESCRIPTION System Architecture

FIG. 1 is a block diagram of a system environment 100 for an onlinesystem 140. The system environment 100 shown by FIG. 1 comprises one ormore client devices 110, a network 120, one or more third-party systems130, and the online system 140. In alternative configurations, differentand/or additional components may be included in the system environment100. The embodiments described herein can be adapted to socialnetworking systems that are content sharing networks or other onlinesystems 140 providing content to users.

The client devices 110 are one or more computing devices capable ofreceiving user input as well as transmitting and/or receiving data viathe network 120. In one embodiment, a client device 110 is aconventional computer system, such as a desktop or a laptop computer.Alternatively, a client device 110 may be a device having computerfunctionality, such as a personal digital assistant (PDA), a mobiletelephone, a smartphone, a smartwatch or another suitable device. Aclient device 110 is configured to communicate via the network 120. Inone embodiment, a client device 110 executes an application allowing auser of the client device 110 to interact with the online system 140.For example, a client device 110 executes a browser application toenable interaction between the client device 110 and the online system140 via the network 120. In another embodiment, a client device 110interacts with the online system 140 through an application programminginterface (API) running on a native operating system of the clientdevice 110, such as IOS® or ANDROID™.

The client devices 110 are configured to communicate via the network120, which may comprise any combination of local area and/or wide areanetworks, using both wired and/or wireless communication systems. In oneembodiment, the network 120 uses standard communications technologiesand/or protocols. For example, the network 120 includes communicationlinks using technologies such as Ethernet, 802.11, worldwideinteroperability for microwave access (WiMAX), 3G, 4G, code divisionmultiple access (CDMA), digital subscriber line (DSL), etc. Examples ofnetworking protocols used for communicating via the network 120 includemultiprotocol label switching (MPLS), transmission controlprotocol/Internet protocol (TCP/IP), hypertext transport protocol(HTTP), simple mail transfer protocol (SMTP), and file transfer protocol(FTP). Data exchanged over the network 120 may be represented using anysuitable format, such as hypertext markup language (HTML) or extensiblemarkup language (XML). In some embodiments, all or some of thecommunication links of the network 120 may be encrypted using anysuitable technique or techniques.

One or more third party systems 130 may be coupled to the network 120for communicating with the online system 140, which is further describedbelow in conjunction with FIG. 2. In one embodiment, a third partysystem 130 is an application provider communicating informationdescribing applications for execution by a client device 110 orcommunicating data to client devices 110 for use by an applicationexecuting on the client device 110. In other embodiments, a third partysystem 130 provides content or other information for presentation via aclient device 110. A third party system 130 may also communicateinformation to the online system 140, such as advertisements, content,or information about an application provided by the third party system130.

In some embodiments, one or more of the third party systems 130 providecontent to the online system 140 for presentation to users of the onlinesystem 140 and provide compensation to the online system 140 in exchangefor presenting the content. For example, a third party system 130provides advertisement requests, which are further described below inconjunction with FIG. 2, including advertisements for presentation andamounts of compensation provided by the third party system 130 forpresenting the advertisements to the online system 140. Other types ofsponsored content may be provided by a third party system 130 to theonline system 140 for presentation by the online system 140 in exchangefor compensation from the third party system 130. Sponsored content froma third party system 130 may be associated with the third party system130 or with an entity on whose behalf the third party system 130operates.

In some embodiments, one or more of the third party systems 130 is atrusted third party system 130 that provides data analysis services tothe online 140. For example, a third party system 130 is an entity, suchas a data analytics provider, that receives information describingactions performed by users of the online system 140 from the onlinesystem 140 or one or more entities external to the online system 140. Invarious embodiments, the third party system 130 receives informationdescribing actions associated with electronic content presented tovarious audiences by various content publishers and identifiesindividuals who performed the actions. In some embodiments, the thirdparty system 130 compiles information describing the actions and theindividuals who performed them, and provides the information to theonline system 140 as a performance metric or as raw data, which theonline system 140 utilizes for generation of a performance metric, asdescribed in more detail in conjunction with FIG. 3 below.

FIG. 2 is a block diagram of an architecture of the online system 140.The online system 140 shown in FIG. 2 includes a user profile store 205,a content store 210, an action logger 215, an action log 220, aconnection store 225, a content selection module 230, a polygon module235, a polygon store 240, an indexing module 245, an edge data store250, a location store 255, and a web server 260. In other embodiments,the online system 140 may include additional, fewer, or differentcomponents for various applications. Conventional components such asnetwork interfaces, security functions, load balancers, failoverservers, management and network operations consoles, and the like arenot shown so as to not obscure the details of the system architecture.

Each user of the online system 140 is associated with a user profile,which is stored in the user profile store 205. A user profile includesdeclarative information about the user that was explicitly shared by theuser and may also include profile information inferred by the onlinesystem 140. In one embodiment, a user profile includes multiple datafields, each describing one or more attributes of the correspondingonline system user. Examples of information stored in a user profileinclude biographic, demographic, and other types of descriptiveinformation, such as work experience, educational history, gender,hobbies or preferences, location and the like. A user profile may alsostore other information provided by the user, for example, images orvideos. In certain embodiments, images of users may be tagged withinformation identifying the online system users displayed in an image,with information identifying the images in which a user is tagged storedin the user profile of the user. A user profile in the user profilestore 205 may also maintain references to actions by the correspondinguser performed on content items in the content store 210 and stored inthe action log 220.

While user profiles in the user profile store 205 are frequentlyassociated with individuals, allowing individuals to interact with eachother via the online system 140, user profiles may also be stored forentities such as businesses or organizations. This allows an entity toestablish a presence on the online system 140 for connecting andexchanging content with other online system users. The entity may postinformation about itself, about its products or provide otherinformation to users of the online system 140 using a brand pageassociated with the entity's user profile. Other users of the onlinesystem 140 may connect to the brand page to receive information postedto the brand page or to receive information from the brand page. A userprofile associated with the brand page may include information about theentity itself, providing users with background or informational dataabout the entity. In some embodiments, the brand page associated withthe entity's user profile may retrieve information from one or more userprofiles associated with users who have interacted with the brand pageor with other content associated with the entity, allowing the brandpage to include information personalized to a user when presented to theuser.

The content store 210 stores objects that each represents various typesof content. Examples of content represented by an object include a pagepost, a status update, a photograph, a video, a link, a shared contentitem, a gaming application achievement, a check-in event at a localbusiness, a brand page, or any other type of content. Online systemusers may create objects stored by the content store 210, such as statusupdates, photos tagged by users to be associated with other objects inthe online system 140, events, groups or applications. In someembodiments, objects are received from third-party applications orthird-party applications separate from the online system 140. In oneembodiment, objects in the content store 210 represent single pieces ofcontent, or content “items.” Hence, online system users are encouragedto communicate with each other by posting text and content items ofvarious types of media to the online system 140 through variouscommunication channels. This increases the amount of interaction ofusers with each other and increases the frequency with which usersinteract within the online system 140.

One or more content items included in the content store 210 includecontent for presentation to a user and a bid amount. The content istext, image, audio, video, or any other suitable data presented to auser. In various embodiments, the content also specifies a page ofcontent. For example, a content item includes a landing page specifyinga network address of a page of content to which a user is directed whenthe content item is accessed. The bid amount is included in a contentitem by a publishing user who provided the content item to the onlinesystem 140 and is used to determine an expected value, such as monetarycompensation, provided by the publishing user to the online system 140if content in the content item is presented to an additional user, ifthe content in the content item receives a user interaction whenpresented, or if any suitable condition is satisfied when content in thecontent item is presented to an additional user. For example, the bidamount included in a content item specifies a monetary amount that theonline system 140 receives from a publishing user who provided thecontent item to the online system 140 if content in the content item isdisplayed. In some embodiments, the expected value to the online system140 of presenting the content from the content item may be determined bymultiplying the bid amount by a probability of the content of thecontent item being accessed by a user.

Various content items may include an objective identifying aninteraction that a publishing user associated with a content itemdesires other users to perform when presented with content included inthe content item. Example objectives include: installing an applicationassociated with a content item, indicating a preference for a contentitem, sharing a content item with other users, interacting with anobject associated with a content item, or performing any other suitableinteraction. As content from a content item is presented to onlinesystem users, the online system 140 logs interactions between userspresented with the content item or with objects associated with thecontent item. Additionally, the online system 140 receives compensationfrom a user associated with content item as online system users performinteractions with a content item that satisfy the objective included inthe content item.

Additionally, a content item may include one or more targeting criteriaspecified by the publishing user who provided the content item to theonline system 140. Targeting criteria included in a content item requestspecify one or more characteristics of users eligible to be presentedwith the content item. For example, targeting criteria are used toidentify users having user profile information, connections, or actionssatisfying at least one of the targeting criteria. Hence, targetingcriteria allow a user to identify users having specific characteristics,simplifying subsequent distribution of content to different users.

In one embodiment, targeting criteria may specify actions or types ofconnections between a user and another user or object of the onlinesystem 140. Targeting criteria may also specify interactions between auser and objects performed external to the online system 140, such as ona third party system 130. For example, targeting criteria identifiesusers that have taken a particular action, such as sent a message toanother user, used an application, joined a group, left a group, joinedan event, generated an event description, purchased or reviewed aproduct or service using an online marketplace, requested informationfrom a third party system 130, installed an application, or performedany other suitable action. Including actions in targeting criteriaallows users to further refine users eligible to be presented withcontent items. As another example, targeting criteria identifies usershaving a connection to another user or object or having a particulartype of connection to another user or object.

In some embodiments, targeting criteria received from a publishing userwho provides a content item to the online system 140 describes aphysical location associated with the publishing user or the contentitem and specifies users determined to be at or within a specifieddistance of the physical location are eligible to receive the contentitem. The physical location may be a physical location of a retailstore, building, or other location where an individual may perform aparticular action associated with the content item or the publishinguser associated with the content item, such as engaging in a purchase ortransaction at the physical location. For example, the online systemreceives an article including information about a business from amanager of the business along with targeting criteria requesting theonline system to present the article to online system users determinedto be visiting a physical location of the business or who are visiting aphysical location within a specified distance of the business.

The action logger 215 receives communications about user actionsinternal to and/or external to the online system 140, populating theaction log 220 with information about user actions. Examples of actionsinclude adding a connection to another user, sending a message toanother user, uploading an image, reading a message from another user,viewing content associated with another user, and attending an eventposted by another user. In addition, a number of actions may involve anobject and one or more particular users, so these actions are associatedwith the particular users as well and stored in the action log 220.

The action log 220 may be used by the online system 140 to track useractions on the online system 140, as well as actions on third partysystems 130 that communicate information to the online system 140. Usersmay interact with various objects on the online system 140, andinformation describing these interactions is stored in the action log220. Examples of interactions with objects include: commenting on posts,sharing links, checking-in to physical locations via a client device110, accessing content items, and any other suitable interactions.Additional examples of interactions with objects on the online system140 that are included in the action log 220 include: commenting on aphoto album, communicating with a user, establishing a connection withan object, joining an event, joining a group, creating an event,authorizing an application, using an application, expressing apreference for an object (“liking” the object), and engaging in atransaction. Additionally, the action log 220 may record a user'sinteractions with advertisements on the online system 140 as well aswith other applications operating on the online system 140. In someembodiments, data from the action log 220 is used to infer interests orpreferences of a user, augmenting the interests included in the user'suser profile and allowing a more complete understanding of userpreferences.

In some embodiments, the action logger 215 receives communications aboutuser actions with content presented to a user and populates the actionlog 220 with information about the actions. Examples of interactionswith content include viewing content items, requesting additionalcontent items for presentation, indicating a preference for a contentitem, sharing a content item with another user, or performing any othersuitable action. A user may interact with content items by providinginputs to a client device 110 presenting content from the online system140. The client device 110 identifies actions corresponding to variousprovided inputs and communicates information describing the identifiedactions to the action logger 215, which stores the informationdescribing the identified actions in the action log 220.

The action log 220 may also store user actions taken on a third partysystem 130, such as an external website, and communicated to the onlinesystem 140. For example, an e-commerce website may recognize a user ofan online system 140 through a social plug-in enabling the e-commercewebsite to identify the user of the online system 140. Because users ofthe online system 140 are uniquely identifiable, e-commerce websites,such as in the preceding example, may communicate information about auser's actions outside of the online system 140 to the online system 140for association with the user. Hence, the action log 220 may recordinformation about actions users perform on a third party system 130,including webpage viewing histories, advertisements that were engaged,purchases made, and other patterns from shopping and buying.Additionally, actions a user performs via an application associated witha third party system 130 and executing on a client device 110 may becommunicated to the action logger 215 by the application for recordationand association with the user in the action log 220.

In one embodiment, the connection store 225 stores informationdescribing connections between users and other objects on the onlinesystem 140 as connections. Some connections may be defined by users,allowing users to specify their relationships with other users. Forexample, users may generate connections with other users that parallelthe users' real-life relationships, such as friends, co-workers,partners, and so forth. Other connections are generated when usersinteract with objects in the online system 140, such as expressinginterest in a page on the online system 140, sharing a link with otherusers of the online system 140, and commenting on posts made by otherusers of the online system 140.

In one embodiment, a connection may include various features eachrepresenting characteristics of interactions between users, interactionsbetween users and objects, or interactions between objects. For example,features included in a connection describe a rate of interaction betweentwo users, how recently two users have interacted with each other, arate or an amount of information retrieved by one user about an object,or numbers and types of comments posted by a user about an object. Thefeatures may also represent information describing a particular objector a particular user. For example, a feature may represent the level ofinterest that a user has in a particular topic, the rate at which theuser logs into the online system 140, or information describingdemographic information about the user. Each feature may be associatedwith a source object or user, a target object or user, and a featurevalue. A feature may be specified as an expression based on valuesdescribing the source object or user, the target object or user, orinteractions between the source object or user and target object oruser; hence, a connection may be represented as one or more featureexpressions.

The connection store 225 also stores information about connections, suchas affinity scores for objects, interests, and other users. Affinityscores, or “affinities,” may be computed by the online system 140 overtime to approximate a user's interest in an object or in another user inthe online system 140 based on the actions performed by the user. Auser's affinity may be computed by the online system 140 over time toapproximate the user's interest in an object, in a topic, or in anotheruser in the online system 140 based on actions performed by the user.Computation of affinity is further described in U.S. patent applicationSer. No. 12/978,265, filed on Dec. 23, 2010, U.S. patent applicationSer. No. 13/690,254, filed on Nov. 30, 2012, U.S. patent applicationSer. No. 13/689,969, filed on Nov. 30, 2012, and U.S. patent applicationSer. No. 13/690,088, filed on Nov. 30, 2012, each of which is herebyincorporated by reference in its entirety. Multiple interactions betweena user and a specific object may be stored as a single connection in theconnection store 225, in one embodiment. Alternatively, each interactionbetween a user and a specific object is stored as a separate connection.In some embodiments, connections between users may be stored in the userprofile store 205, or the user profile store 205 may access theconnection store 225 to determine connections between users.

The content selection module 230 selects one or more content items forcommunication to a client device 110 to be presented to a user. Contentitems eligible for presentation to the user are retrieved from thecontent store 210 or from another source by the content selection module230, which selects one or more of the content items for presentation tothe user. A content item eligible for presentation to the user is acontent item associated with at least a threshold number of targetingcriteria satisfied by characteristics of the user or is a content itemthat is not associated with targeting criteria. In various embodiments,the content selection module 230 includes content items eligible forpresentation to the user in one or more selection processes, whichidentify a set of content items for presentation to the user. Forexample, the content selection module 230 determines measures ofrelevance of various content items to the user based on characteristicsassociated with the user by the online system 140 and based on theuser's affinity for different content items. Information associated withthe user included in the user profile store 205, in the action log 220,and in the connection store 225 may be used to determine the measures ofrelevance. Based on the measures of relevance, the content selectionmodule 230 selects content items for presentation to the user. As anadditional example, the content selection module 230 selects contentitems having the highest measures of relevance or having at least athreshold measure of relevance for presentation to the user.Alternatively, the content selection module 230 ranks content itemsbased on their associated measures of relevance and selects contentitems having a highest positions in the ranking or having at least athreshold position in the ranking for presentation to the user.

Content items eligible for presentation to the user may include contentitems associated with bid amounts. The content selection module 230 usesthe bid amounts associated with ad requests when selecting content forpresentation to the user. In various embodiments, the content selectionmodule 230 determines an expected value associated with various contentitems based on their bid amounts and selects content items associatedwith a maximum expected value or associated with at least a thresholdexpected value for presentation. An expected value associated with acontent item represents an expected amount of compensation to the onlinesystem 140 for presenting the content item. For example, the expectedvalue associated with a content item is a product of the bid amountassociated with the content item and a likelihood of the userinteracting with the content item. The content selection module 230 mayrank content items based on their associated bid amounts and selectcontent items having at least a threshold position in the ranking forpresentation to the user. In some embodiments, the content selectionmodule 230 ranks both content items not associated with bid amounts andcontent items associated with bid amounts in a unified ranking based onbid amounts and measures of relevance associated with content items.Based on the unified ranking, the content selection module 230 selectscontent for presentation to the user. Selecting content items associatedwith bid amounts and content items not associated with bid amountsthrough a unified ranking is further described in U.S. patentapplication Ser. No. 13/545,266, filed on Jul. 10, 2012, which is herebyincorporated by reference in its entirety.

For example, the content selection module 230 receives a request topresent a feed of content (also referred to as a “content feed”) to auser of the online system 140. The feed may include one or more contentitems associated with bid amounts (i.e., “sponsored content items”) aswell as organic content items, such as stories describing actionsassociated with other online system users connected to the user. Thecontent selection module 230 accesses one or more of the user profilestore 205, the content store 210, the action log 220, and the connectionstore 225 to retrieve information about the user. For example,information describing actions associated with other users connected tothe user or other data associated with users connected to the user areretrieved. Content items from the content store 210 are retrieved andanalyzed by the content selection module 230 to identify candidatecontent items eligible for presentation to the user. For example,content items associated with users who not connected to the user orstories associated with users for whom the user has less than athreshold affinity are discarded as candidate content items. Based onvarious criteria, the content selection module 230 selects one or moreof the content items identified as candidate content items forpresentation to the identified user. The selected content items areincluded in a feed of content that is presented to the user. Forexample, the feed of content includes at least a threshold number ofcontent items describing actions associated with users connected to theuser via the online system 140.

In various embodiments, the content selection module 230 presentscontent to a user through a feed including a plurality of content itemsselected for presentation to the user. One or more content itemsassociated with bid amounts may be included in the feed. The contentselection module 230 may also determine an order in which selectedcontent items are presented via the feed. For example, the contentselection module 230 orders content items in the feed based onlikelihoods of the user interacting with various content items.

The polygon module 235 determines a polygon comprising a plurality ofedges bounding a representation of a physical location on a geographicmap. In some embodiments, the physical location is associated with anonline system user or a content item provided to the online system 140by an online system user for presentation by the online system 140. Forexample, the physical location is a physical location of a retail store,a building, or other location where an individual may perform aparticular action (e.g., a purchase or transaction) associated with acontent item presented by the online system 140 or a user associatedwith the content item. In various embodiments, the physical location isdescribed by targeting criteria received along with a content item whichidentifies a physical location associated with the content item andspecifies users determined to be at or within a specified distance ofthe physical location are eligible to receive the content item. Forexample, the online system 140 receives a post describing an exhibit ata natural history museum from an administrator of the museum along withtargeting criteria requesting the online system 140 to present the postto online system users determined to be visiting a physical location ofthe museum or who are visiting a physical location within 50 meters ofthe museum.

If the online system 140 receives targeting criteria describing aphysical location associated with an online system user or a contentitem provided by the user, the polygon module 235 identifies a positionof the physical location on a geographic map and determines a polygonrepresenting the physical location on the map. For example, the polygonmodule 235 identifies a plurality of map coordinates representing aposition of each corner of a building associated with a content item ona map and traces a polygon on the map having vertices at the identifiedmap coordinates. In various embodiments, the polygon module 235 alsogenerates a polygon identifier associated with each determined polygonand stores the polygon identifier with information describing thepolygon, the physical location represented by the polygon and the userand/or content item associated with the physical location in the polygonstore 240.

In various embodiments, the position, size and shape of the polygonrepresent the position, size and shape of the physical location on themap such that each edge of the polygon corresponds to a wall or otherboundary enclosing an area of the physical location on the map. Forexample, if the physical location is a coffee shop having a rectangularbuilding and an adjacent semi-circular seating area, the polygon module235 determines a polygon having three edges joined at right anglesforming three sides of the rectangular building and multiple edgesjoined at obtuse angles forming the semi-circular seating area adjacentto the building. Hence, the polygon may have an irregular shape definedby multiple edges having different dimensions.

The polygon store 240 stores information describing polygons determinedby the polygon module 235. In various embodiments, the polygon module235 determines polygons representing physical locations associated witha user or content item provided by the user and polygon identifiersassociated with each determined polygon. The polygon store 240 stores apolygon identifier generated for each polygon in association withinformation describing the polygon, the physical location represented bythe polygon and the user and/or content item associated with thephysical location. For example, information stored in the polygon store240 along with a polygon identifier generated for a polygon includes abuilding identifier associated with a physical location represented bythe polygon, geographic coordinates representing a position of eachcorner of the building on a map, and a content item identifierassociated with a content item associated with the physical location.Hence, the polygon store 240 stores information from which the onlinesystem 140 may identify a polygon associated with a physical locationand an online system user and/or content item associated with thepolygon and physical location.

The indexing module 245 determines edge data describing a position ofeach edge of a polygon on a geographic map and generates an edge indexassociated with each edge based on the edge data. In variousembodiments, edge data determined by the indexing module 245 comprises aplurality of edge coordinates associated with each edge. Edgecoordinates associated with an edge are grid coordinates whichcollectively represent a position and size of the edge on a geographicmap. Example edge coordinates include latitude coordinates, longitudecoordinates, y-coordinates, x-coordinates, and any other gridcoordinates suitable for identifying a position of a point on a maprelative to one or more fixed axes of the map. Hence, the indexingmodule 245 determines edge data describing a position of each edge of apolygon determined by the polygon module 235 on a map by determining aplurality of edge coordinates that each identifies a position of a pointof an edge on the map relative to one or more fixed axes of the map. Forexample, the indexing module 245 retrieves information describing alocation of a polygon on a geographic map from the polygon store 240 anddetermines map coordinates for each point of each edge of the polygon onthe map.

The indexing module 245 also generates an edge index for each edge of apolygon based on the edge data determined for each edge of the polygon.An edge index generated for an edge comprises a set of edge coordinatesrepresenting a position of each endpoint of the edge along a specifiedaxis of a geographic map, such as a vertical axis or a horizontal axis.For example, the indexing module 245 generates an edge index for an edgeof a polygon comprising latitudinal coordinates identifying a positionof each endpoint of the edge on a vertical axis of the map, allowing theonline system 140 to store information describing a vertical area of themap occupied by the edge's height on the map (e.g., a vertical footprintof the edge on the map). As another example, the indexing module 245generates an edge index for an edge comprising longitudinal coordinatesidentifying a position of each endpoint of the edge on a horizontal axisof the map, allowing the online system 140 to store informationdescribing a horizontal area of the map occupied by the edge's length onthe map. Each edge index generated by the indexing module 245 is storedby the indexing module 245 in the edge data store 250 along with theedge data associated with the edge and an identifier associated with thepolygon formed by the edge, in various embodiments.

In some embodiments, the indexing module 245 also determines an edgeboundary surrounding each edge of a polygon on a geographic map andstores information describing the edge boundary in the edge data store250. While an edge index describes a position and dimension of an edgealong a vertical or horizontal axis of the map, an edge boundarydescribes a position and dimension of the edge along a vertical andhorizontal axis of the map, in some embodiments. In various embodiments,the indexing module 245 determines a geometric boundary circumscribingeach edge of a polygon on a map and stores a set of edge boundarycoordinates identifying multiple points on the map comprising an edgeboundary. For example, the indexing module 245 determines and stores aset of edge boundary coordinates identifying a position of each cornerof a rectangle circumscribing an edge of a polygon on a map. In thepreceding example, a length of a horizontal dimension of the edgeboundary corresponds to a length of the edge along a horizontal axis ofthe map and a height of a vertical dimension of the edge boundarycorresponds to a height of the edge along a vertical axis of the map. Asanother example, the indexing module 245 determines and stores a set ofedge boundary coordinates identifying an area of a circle circumscribingan edge of a polygon on a map. In various embodiments, informationdescribing each determined edge boundary is stored in the edge datastore 250 along with edge data associated with an edge for which theedge boundary was determined, an edge index associated with the edge,and a polygon identifier associated with a polygon formed by the edge.Hence, the indexing module 245 determines edge data describing aposition of each edge of a polygon on a map and uses the edge data togenerate edge indexes describing a position of each edge of the polygonalong a vertical or horizontal axis of the map and to determine edgeboundaries surrounding each edge along a vertical and horizontal axis ofthe map, in some embodiments.

The edge data store 250 stores information determined or generated bythe indexing module 245 describing edges of polygons representingphysical locations on a geographic map. In various embodiments,information stored in the edge data store 250 includes edge data, edgeindexes and edge boundary coordinates associated with each edge of apolygon determined by the polygon module 235. For example, the edge datastore 250 includes edge data comprising a set of map coordinatesrepresenting a position of each point of each edge of a polygon on amap, a set of edge indexes comprising a set of endpoint coordinatesassociated with each edge of the polygon identifying a position of eachendpoint of an edge along a specified axis of the map, and a set of edgeboundary coordinates representing a position of each corner of ageometric boundary surrounding each edge of the polygon on the map. Invarious embodiments, a polygon identifier generated by the polygonmodule 235 and stored in association with the information included inthe edge data store 250 allows the online system 140 to identify apolygon associated with each edge described by the stored information.For example, the online system 140 retrieves edge data describing anedge of a polygon from the edge data store 250 and identifies thepolygon by matching a polygon identifier stored in association with theedge data and a polygon identifier stored in the polygon store 240 inassociation with information describing the polygon. Hence, the edgedata store 250 stores information from which the online system 140 mayidentify positions of edges of a polygon on a map and a polygon formedby the edges.

In some embodiments, the online system 140 queries the edge data store250 for edges having a specified position on a map using a set ofindexed edge coordinates and identifies one or more polygons formed bythe set of edges based on one or more polygon identifiers associatedwith edges of the set. In one embodiment, the online system 140 queriesthe edge data store 250 to retrieve a set of edges associated with edgeindexes describing a position of each endpoint of an edge above andbelow a specified position on a vertical axis of a map and performs oneor more operations on the set of edges. For example, the online system140 performs one or more operations on the set of edges to determinewhether an online system user is within an area of a map represented bya polygon based on the retrieved set of edges, as described below inconjunction with FIGS. 3-9.

In various embodiments, the location Store 255 stores locationinformation received from client devices 110 associated with onlinesystem users describing geographic locations of the client devices 110and user identifying information identifying online system usersassociated with the client devices. Location information is anyinformation suitable for identifying a geographic location of a clientdevice 110 associated with an online system user from which the onlinesystem 140 may determine a geographic location of the online systemuser. For example, location information describes a street address, alocation identifier and/or geographic coordinates of a geographiclocation of a client device 110 and information identifying a userassociated with the client device 110 to the online system 140 (e.g., auser identifier of the user), which the online system 140 associateswith the user and stores in the location store 255.

In some embodiments, the online system 140 receives location informationalong with information identifying an online system user from a clientdevice 110 associated with the user, while in other embodiments, theonline system 140 receives location information from a client device 110associated with an online system user and subsequently retrievesinformation identifying the user from the client device 110. In variousembodiments, the online system 140 receives location informationdescribing a geographic location of a client device 110, a timeassociated with the geographic location, and information identifying auser associated with the client device 110, and stores the receivedinformation in association with the identified user in the locationstore 255 for subsequent retrieval.

Location information may be communicated to the online system 140 by aclient device 110 or an application executing on the client device 110when a user of the client device 110 requests to share a location withthe online system 140. For example, the online system 140 receiveslocation information from a client device 110 when a user of the clientdevice 110 requests to share a location with the online system 140 bychecking-in to a physical location (e.g., a restaurant) via the clientdevice 110 or via an application executing on the client device 110.Location information may also be communicated to the online system 140by a client device 110 or an application executing on the client device110 when the client device 110 is within a threshold distance of aspecified location, at periodic time intervals, or when any othersuitable condition is satisfied. For example, the online system 140receives location information from a client device 110 or an applicationexecuting on the client device 110 when the client device 110 is withina threshold distance of certain devices for connecting to a network(e.g., wireless access points or cellular phone towers). As anotherexample, the online system 140 receives location information from aclient device 110 or an application executing on the client device 110when a location of the client device 110 changes, allowing the onlinesystem 140 to maintain information describing a current location of theclient device 110.

In some embodiments, the online system 140 receives location informationfrom a third party system 130 that combines a geographic location of aclient device 110 with information identifying a user of the clientdevice 110 to the online system 140. For example, the online system 140receives a geographic location of a user of the online system 140 andinformation identifying the user to the online system 140 from a thirdparty system 130 and stores the geographic location in association withthe identified user in the location store 255. In the preceding example,the third party system 130 may receive information indicating the uservisited the geographic location via a client device 110 associated withthe third party system 130. For example, the third party system 130identifies the online system user based on information provided to thethird party system 130 by the user at a point of sale terminal used bythe user to engage in a financial transaction at the location.

In some embodiments, the online system 140 updates location informationstored in the location store 255 (e.g., upon receipt of updated locationinformation) to include a historical record of a user's locations overvarious time intervals. If the online system 140 updates stored locationinformation, the online system 140 may maintain location informationpreviously stored in the location store 255 when the updated locationinformation is stored or may remove previously stored locationinformation from the location store 255 and store the updated locationinformation in its place, in various embodiments For example, the onlinesystem 140 receives updated location information in response to a changein the location of a client device 110 associated with an online systemuser and stores the updated location information in the location store255 along with location information previously received from the clientdevice 110 within a particular time interval

In some embodiments, location information identifies a geographiclocation associated with a content item presented by the online system140 or a user who provided the content item to the online system 140 forpresentation by the online system 140. Additionally, locationinformation may identify an occurrence of an event associated with thecontent item or user who provided the content item to the online system140. For example, location information identifies physical locations ofretail stores, buildings, or other locations where a user has performeda particular action (e.g., a purchase or transaction) associated with acontent item presented by the online system 140 or a user associatedwith the content item. In various embodiments, a publishing user whoprovides content to the online system 140 or a user associated with thecontent identifies an action and a physical location associated with theaction, and location information received by the online system 140identifies users that performed the action at the physical location.

In some embodiments, location information stored in the location store255 also includes various attributes of the locations, such as types ofconnections to a network (e.g., BLUETOOTH®, 802.11, global positioningsystem, etc.) available from a location, identifiers of wireless accesspoints within a threshold distance of the location, identifiers ofcellular phone towers within a threshold distance of the location, orother suitable information. For example, location information describingan event occurring at a physical location associated with a content itempresented by the online system 140 includes a type of network connectionavailable at the location for transmitting information from a clientdevice 110 to the online system 140.

The web server 260 links the online system 140 via the network 120 tothe one or more client devices 110, as well as to the one or more thirdparty systems 130. The web server 260 serves web pages, as well as othercontent, such as JAVA®, FLASH®, XML and so forth. The web server 260 mayreceive and route messages between the online system 140 and the clientdevice 110; for example, the messages are instant messages, queuedmessages (e.g., email), text messages, short message service (SMS)messages, or messages sent using any other suitable messaging technique.A user may send a request to the web server 260 to upload information(e.g., images or videos) that are stored in the content store 210.Additionally, the web server 260 may provide application programminginterface (API) functionality to send data directly to native clientdevice operating systems, such as IOS®, ANDROID™, WEBOS® orBlackberryOS.

Determining an Online System User's Eligibility for Receiving a ContentItem Associated with a Physical Location Using a Polygon Representingthe Physical Location

FIG. 3 is a flow chart of a method for determining an online systemuser's eligibility for receiving a content item associated with aphysical location using a polygon representing the physical location. Inother embodiments, the method may include different and/or additionalsteps than those shown in FIG. 3. Additionally, steps of the method maybe performed in different orders than the order described in conjunctionwith FIG. 3 in various embodiments.

The online system 140 receives 300 a content item and informationdescribing a physical location associated with the content item from anonline system user. In some embodiments, the content item is a sponsoredcontent item for which the online system 140 receives compensation inexchange for presenting to online system users, while in otherembodiments, the content item is an organic content item for which theonline system 140 does not receive compensation in exchange forpresenting to the users. Example types of content items received 300 bythe online system 140 include location check-ins, posts, status updates,images, audio data, video data, articles, etc. In various embodiments,the online system 140 receives 300 the content item from a publishinguser of the online system 140 with a request to present the content itemto additional online system users meeting certain targeting criteriawhich specify characteristics of online system users eligible to bepresented with the content item.

In various embodiments, targeting criteria received 300 along with thecontent item includes information describing the physical locationassociated with the content item and specifies users determined by theonline system 140 to be at or within a specified distance of thephysical location are eligible to receive the content item. The physicallocation associated with the content item may be a building, a landmark,a retail store, a neighborhood or any other physical location associatedwith an online system user from whom the content item was received orwith a product or service identified by the content item (includingphysical locations where brands, products or services associated withthe content item may be promoted or sold). Example types of informationdescribing the physical location associated with the content iteminclude: a building identifier, a street address, a set of geographiccoordinates, a neighborhood identifier, and a landmark identifier. As anexample, the online system 140 receives 300 an article describing arestaurant from an owner of the restaurant along with targeting criteriarequesting the online system 140 to present the article to online systemusers determined to be visiting a physical location of the restaurant orwho are visiting a physical location within 70 meters of the restaurant.For example, the targeting criteria includes a street addressidentifying the physical location of the restaurant to the online system140.

Based on the received information describing the physical locationassociated with the content item, the online system 140 identifies aposition of the physical location on a geographic map and determines 305a polygon having a plurality of edges bounding a representation of thephysical location on the map. For example, referring to FIG. 4, theonline system 140 identifies a representation 400 of the physicallocation on a geographic map and determines a plurality of mapcoordinates representing a position of each corner of a building at thephysical location on the map. In this example, the online system 140traces a polygon 410 on the map having vertices at the identified mapcoordinates such that the edges of the polygon 410 bound therepresentation 400 of the physical location on the map.

In various embodiments, the position, size and shape of the polygon 410represent the position, size and shape of the physical location on themap and each edge of the polygon 410 corresponds to a wall or otherboundary enclosing an area of the physical location on the map. Forexample, if the physical location is a coffee shop having a rectangularbuilding and an adjacent circular outdoor seating area, the onlinesystem 140 determines 305 a polygon 410 having three edges joined atright angles forming three sides of the rectangular building andmultiple edges joined at obtuse angles forming the circular seating areaadjacent to the building. Hence, the polygon 410 may have an irregularshape defined by multiple edges having different dimensions.

The online system 140 determines 310 edge data describing a position ofeach edge of the polygon 410 on the map and stores 325 the edge data inthe edge data store 250 of the online system 140. In variousembodiments, the edge data determined 310 by the online system 140comprises a plurality of edge coordinates associated with each edge ofthe polygon 410 that represent a plurality of points on the mapcomprising each edge. For example, edge coordinates associated with anedge include grid coordinates that each represent a position of eachpoint of the edge on the map and collectively represent a position ofthe edge on the map. Example edge coordinates which comprise the edgedata determined 310 by the online system 140 include latitudecoordinates, longitude coordinates, y-coordinates, x-coordinates, andany other grid coordinates determined 310 by the online system 140 whichare suitable for identifying a position of a point on a map relative toone or more fixed axes of the map. Hence, in some embodiments, theonline system 140 determines 310 edge data describing a position of eachedge of the polygon 410 on the map by determining 310 a plurality ofedge coordinates that each identifies a position of a point of an edgeon the map relative to one or more fixed axes of the map. In variousembodiments, the edge data is stored 325 in the edge data store 250along with an identifier associated with the polygon 410 formed by theedge, allowing the online system 140 to identify a polygon 410associated with the edge data.

Based on the determined edge data, the online system 140 generates 315and stores 325 an edge index for each edge of the polygon 410 describinga position of each endpoint of the edge along a specified axis of themap. In some embodiments, the specified axis of the map is a verticalaxis, while in other embodiments, the specified axis of the map is ahorizontal axis. In various embodiments, the edge index generated 315for each edge comprises a set of edge coordinates representing aposition of each endpoint of the edge along the specified axis of themap. Once generated 315, an edge index is stored 325 in the edge datastore 250 with the edge data and an identifier associated with thepolygon formed by the edge, in various embodiments.

Storing 325 an edge index for each edge of the polygon 410 allows theonline system 140 to store 325 information describing an area of the mapoccupied by a dimension of the edge (e.g., a vertical or horizontalfootprint of the edge) for subsequent retrieval. For example, referringto FIG. 5A, the online system 140 identifies latitudinal edgecoordinates included in the edge data for each edge of the polygon 410and determines a position of each endpoint 500 of each edge along avertical axis of the map. The online system 140 generates 315 an edgeindex for each edge comprising latitudinal coordinates 510 that identifya position of each endpoint 500 of the edge on a vertical axis of themap, allowing the online system 140 to store 325 information describinga vertical area of the map occupied by each edge's height on the map(e.g., a vertical footprint of the edge on the map). As another example,the online system 140 generates 315 an edge index for an edge comprisinglongitudinal coordinates identifying a position of each endpoint of theedge on a horizontal axis of the map, allowing the online system 140 tostore 325 information describing a horizontal area of the map occupiedby the edge's length on the map.

The online system 140 stores 325 each edge index in the edge data store250 along with the edge data and an identifier associated with thepolygon 410. For example, referring to FIG. 6, the online system 140generates and stores 325 an edge data table 600 including a plurality ofedge indexes 610 generated 315 for each edge of the polygon 410 and apolygon identifier 620 associated with the polygon 410. In this example,each edge index 610 comprises latitudinal coordinates 510 identifying aposition of each endpoint 500 of the edge on a vertical axis of the map.The polygon identifier 620 stored in association with an edge index 610and edge data allows the online system 140 to identify a polygon 410formed by an edge associated with the edge index 610 and edge data. Asshown in FIG. 6, each edge index 610 is also stored 325 in associationwith an edge identifier 630, in some embodiments. An edge identifier 630stored in association with each edge index 610 allows the online system140 to identify an edge having endpoints 500 described by the associatededge index 610. For example, the online system 140 identifies edgesassociated with edge identifiers 630 stored in association with certainedge indexes 610 and performs operations on the identified edges todetermine an online system user's eligibility to receive the contentitem associated with the physical location, as described in furtherdetail below in conjunction with FIGS. 7-10.

Referring back to FIG. 3, in various embodiments, the online system 140also determines 320 an edge boundary surrounding each edge of thepolygon 410 on the map and stores 325 information describing the edgeboundary in the edge data store 250 along with the edge data, edge index610 and polygon identifier 620 associated with the edge. While an edgeindex 610 describes a position and dimension of an edge along a verticalor horizontal axis of the map, an edge boundary describes a position anddimension of the edge along a vertical and horizontal axis of the map,in some embodiments. In various embodiments, the online system 140determines 320 a geometric boundary circumscribing each edge of thepolygon 410 on the map and stores 325 a set of edge boundary coordinatesidentifying multiple points on the map comprising an edge boundaryassociated with each edge. For example, referring to FIG. 5B, the onlinesystem 140 traces a rectangular edge boundary 520 circumscribing an edgeof the polygon on the map such that a length of a horizontal dimensionof the edge boundary 520 corresponds to a length of the edge along alongitudinal axis of the map and a height of a vertical dimension of theedge boundary 520 corresponds to a height of the edge along alatitudinal axis of the map. In this example, the online system 140determines 320 a set of edge boundary coordinates identifying a positionof each corner of the rectangular edge boundary 520 on the map andstores 325 the set of edge boundary coordinates in the edge data store250 along with the edge data, edge indexes 610 and polygon identifier620.

In the example of FIG. 6, the online system 140 stores 325 a set of edgeboundary coordinates 640 determined 320 for each edge of the polygon 410in an edge data table 600 in association with an edge identifier 630associated with an edge and a polygon identifier 620 associated with thepolygon 410. In this example, each set of edge boundary coordinates 640associated with an edge comprises latitudinal and longitudinalcoordinates identifying a position of each corner of the edge boundary520 relative to a horizontal and vertical axis of the map. In otherembodiments, the online system 140 determines 320 and stores 325 a setof edge boundary coordinates identifying an area or circumference of acircle which circumscribes an edge of the polygon 410 on the map andforms an edge boundary around the edge. Hence, the online system 140determines 310 edge data describing a position of each edge of thepolygon 410 on the map and uses the edge data to generate 315 edgeindexes describing a position of each endpoint of each edge of thepolygon 410 along a vertical or horizontal axis of the map and todetermine 320 edge boundaries surrounding each edge along a vertical andhorizontal axis of the map.

To determine whether an online system user is at or within a thresholddistance of the physical location, the online system 140 determines ageographic location associated with the user based on received locationinformation describing a geographic location of a client device 110associated with the user. In various embodiments, the online system 140receives 330 location information and user identifying information froma client device 110 associated with the user, allowing the online system140 to determine a geographic location of the user. For example,location information received 330 by the online system 140 includes astreet address, a location identifier and/or geographic coordinates of ageographic location of a client device 110; user identifying informationreceived 330 along with the location information includes a useridentifier associated with an online system user associated with theclient device 110. In various embodiments, the online system 140determines a geographic location of a user by associating a geographiclocation of a client device 110 described by the location informationand an online system user identified by the user identifyinginformation, i.e. the user identified by the user identifyinginformation is determined to be at the geographic location described bythe location information.

In various embodiments, location information is received 330 from aclient device 110 when a user of the client device 110 requests to sharea location with the online system 140. For example, the online system140 receives 330 location information from a client device 110 when auser checks-in to a physical location via the client device 110 or viaan application executing on the client device 110. The online system 140may also receive 330 location information from a client device 110 whenthe client device 110 is within at least a threshold distance from aparticular physical location or at various predetermined time intervals,in some embodiments. For example, the online system 140 receives 330location information from a client device 110 or from an applicationexecuting on the client device 110 when the client device 110 is withina threshold distance of certain devices for connecting to a network(e.g., wireless access points or cellular phone towers).

In yet other embodiments, the online system 140 receives 330 locationinformation from a third party system 130 that combines a geographiclocation of a client device 110 with information identifying a user ofthe client device 110 to the online system 140. For example, the onlinesystem 140 receives 330 location information from a third party system130 identifying a physical location associated with the third partysystem 130 along with information identifying an online system user whovisited the physical location. The physical location associated with thethird party system 130 and information identifying the online systemuser are combined to form location information that is communicated tothe online system 140 by a device associated with the third party system130, such as a point of sale terminal used by the user to engage in afinancial transaction at a physical location, or may be obtained fromthe device by the third party system 130, which communicates thelocation information to the online system 140.

Based on the received location information, the online system 140identifies a position of the geographic location on the map anddetermines 335 a location point representing a position of thegeographic location on the specified axis of the map. For example, theonline system 140 determines a set of location coordinates identifying aposition of the geographic location on the map and determines 335 alocation point based on the set of location coordinates; the locationpoint identifies a position of the geographic location on the specifiedaxis of the map. For example, if the received location informationincludes a set of geographic coordinates identifying a latitude andlongitude of the geographic location and the specified axis of the mapis a vertical axis, the online system 140 determines 335 the locationpoint is the received latitude coordinate. As another example, if theonline system 140 has generated 315 edge indexes representing a positionof each endpoint of an edge of the polygon 410 along a longitudinal axisof the map, the location point identifies a position of the geographiclocation on the longitudinal axis of the map.

The location point may be a latitude coordinate, a longitude coordinate,an x-coordinate, a y-coordinate, or any other grid coordinate determined335 by the online system 140 which is suitable for identifying aposition of a point on a map relative to one or more fixed axes of themap. In the example of FIG. 7A, the online system 140 receives 330location information describing a geographic location 700A of a clientdevice 110 associated with an online system user and determines a set oflocation coordinates identifying a position of the geographic location700A on the map. In this example, the online system 140 determines a setof location coordinates identifying a position of the geographiclocation 700A on the map are 37.798121° N, 122.407447° W. Based on theset of location coordinates, the online system 140 determines 335 alocation point identifying a position of the geographic location 700A onthe specified axis of the map, which is the vertical axis of the map inthis example. Hence, in this example, the location point corresponds tothe latitude coordinate 705A of 37.798121° N. As another example,referring to FIG. 7B, the online system 140 receives 330 locationinformation describing a geographic location 700B of a client device 110associated with an online system user and determines a set of locationcoordinates identifying a position of the geographic location 700B onthe map are 37.798221° N, 122.407088° W. Based on the set of locationcoordinates, the online system 140 determines 335 a location pointidentifying a position of the geographic location 700B on the verticalaxis of the map is the latitude coordinate 705B of 37.798221° N.

Returning to FIG. 3, to determine whether the client device 110 is atthe physical location, the online system 140 retrieves 340 a set ofedges of the polygon 410 that span the location point along thespecified axis of the map. An edge spans the location point along thespecified axis of the map if a point of the edge has a position on thespecified axis of the map represented by the location point.Additionally, an edge spans the location point along the specified axisof the map if the edge has an endpoint on both sides of the locationpoint along the specified axis of the map. For example, if the specifiedaxis of the map is a vertical axis, an edge having endpoints above andbelow the position identified by the location point on the vertical axisof the map spans the location point along the specified axis of the map.Similarly, if the specified axis of the map is a horizontal axis, anedge having endpoints to the left and right of the position identifiedby the location point on the horizontal axis of the map spans thelocation point along the specified axis of the map.

In various embodiments, the online system 140 queries the edge datastore 250 using a set of indexed edge coordinates to retrieve 340 theset of edges that span the location point along the specified axis ofthe map. In some embodiments, the online system 140 submits a query tothe edge data store 250 that specifies a coordinate representing aposition on the specified axis of the map matching the position of thelocation point and requests a set of edges that span the location pointalong the specified axis. In response to the query, edges associatedwith a set of indexed edge coordinates representing a position of eachendpoint of the edge on opposite sides of the location point along thespecified axis of the map are returned. For example, referring to FIG.8A, the online system 140 queries the edge data store 250 for a set 805of edges 810A, E that span a latitude coordinate 705A of 37.798121° N,which identifies a position on the map of the location point 800Adetermined 335 by the online system 140 in the example of FIG. 7A. Inresponse to this query, a set 805 of edges 810A, E associated withindexed edge coordinates representing a position of each endpoint of theedges 810A, E above and below the latitude coordinate 705A of 37.798121°N are retrieved 340. In this example, the retrieved set 805 of edges810A, E includes an edge 810A having a set of indexed edge coordinatesat latitude 37.798252° N and 37.797982° N, and an edge 810E having a setof indexed edge coordinates at latitude 37.798156° N and 37.798036° N.Hence, the online system 140 retrieves 340 edges 810A, E which haveendpoints above and below latitude 37.798121° N and therefore span thelocation point 800A based on the set of indexed endpoints described bythe stored edge indexes.

As another example, referring to FIG. 8B, the online system 140 queriesthe edge data store 250 for a set 815 of edges 810A, C that span alatitude coordinate 705B of 37.798221° N, which identifies a position onthe map of the location point 800B determined 335 by the online system140 in the example of FIG. 7B. In response to the query, edge indexesassociated with each edge of the polygon 410 stored 325 in the edge datastore 250 are used to identify edges 810A, C having endpoints above andbelow latitude 37.798221° N. In this example, a set 815 of edges 810A, Cincluding an edge 810A having indexed endpoints at latitude 37.798252° Nand 37.797982° N, and an edge 810C having indexed endpoints at latitude37.798273° N and 37.798199° N is identified and retrieved 340 by theonline system 140.

In some embodiments, the set of edges retrieved 340 by the online system140 may include edges of different polygons. For example, if the onlinesystem 140 receives 300 targeting criteria describing different physicallocations associated with one or more content items and determines 310 apolygon representing each physical location, the edge data and edgeindexes determined 310, 320, generated 315 and stored 325 by the onlinesystem 140 include edge coordinates associated with each polygon and theretrieved set of edges includes edges of one or more of each polygonthat span the location point along the specified axis of the map. If theset of edges retrieved 340 by the online system 140 includes edges ofdifferent polygons, the online system 140 identifies a polygonassociated with each edge included in the set of edges based on apolygon identifier stored with the edge data associated with each edge,in various embodiments. Hence, the set of edges spanning the locationpoint may include one or more edges of different polygons.

Referring again to FIG. 3, the online system 140 uses the retrieved setof edges to determine 350 whether the client device 110, and thereforethe user of the client device 110, is at the physical locationassociated with the content item. To determine 350 whether the clientdevice 110 is at the physical location, the online system 140 compares345 the position of the location point and the position of each edge ofthe set of edges on an axis of the map perpendicular to the specifiedaxis and computes a value associated with the comparison. For example,if the location point represents a position of the geographic locationof the client device 110 on a vertical axis of the map, the onlinesystem 140 compares 345 a position of each edge of the set of edgesrelative to the location point on a horizontal axis of the map andcomputes a number of edges of the set of edges on one side of thelocation point along the horizontal axis.

In some embodiments, the online system 140 performs the comparison bytracing a ray from the position of the location point on the map alongan axis of the map perpendicular to the specified axis and computes avalue describing a number of edges of the set of edges intersected bythe ray. For example, as illustrated in FIG. 9A, since the locationpoint 800A determined in FIG. 7A represents a position of the geographiclocation of the client device 110 on a vertical axis of the map, theonline system 140 traces a ray 900 from the location point 800A along ahorizontal axis of the map and computes a number of edges of the set 805of edges 810A, E intersected by the ray 900. In this example, a ray 900from the location point 800A along a horizontal axis of the mapintersects one edge 810A of the set 805 of edges 810A, E. As anadditional example, referring to FIG. 9B, the online system 140 traces aray 910 from the position of the location point 800B on the map along anaxis of the map perpendicular to the specified axis and computes anumber of two edges 810A, C of the set 815 of edges 810A, C intersectedby the ray 910. If the set of edges includes edges of differentpolygons, the online system 140 computes a value describing a number ofedges of each polygon included in the set of edges intersected by theray. For example, the online system 140 computes a number of edgesassociated with each of one or more polygon identifiers associated withthe set of edges intersected by the ray.

Based on the computed value associated with the comparison of theposition of the location point and the position of each edge of the setof edges, the online system 140 determines whether the client device 110is within an area of the map represented by the polygon 410. In variousembodiments, the online system 140 determines the client device 110 iswithin an area of the map represented by the polygon 410 if the computedvalue indicates an odd number of edges of the set of edges areintersected by a ray from a position of the location point along an axisof the map perpendicular to the specified axis. For example, referringagain to FIG. 9A, the online system 140 traces a ray 900 from thelocation point 800A along a horizontal axis of the map and determinesthe client device 110 is within an area of the map represented by thepolygon 410 since one edge 810A of the set 805 of edges 810A, E isintersected by the ray 900. As illustrated in this example, a ray 900from the location point 800A intersecting an odd number of edges of thepolygon 410 along an axis of the map perpendicular to the specified axisindicates the location point 800A is within an area of the map bound bythe edges of the polygon 410. If the computed value is associated with aset of edges including edges of more than one polygon, the online system140 determines the client device 110 is within an area of the maprepresented by a particular polygon if the value indicates an odd numberof edges of the particular polygon are intersected by the ray. Forexample, the online system 140 identifies a particular polygon having anodd number of edges intersected by the ray based on a polygon identifierassociated with the odd number of edges.

If the client device 110 is determined to be within an area of the maprepresented by the polygon 410, the online system 140 determines 350 theclient device 110 is at the physical location and the user associatedwith the client device 110 is eligible to be presented with a contentitem associated with the physical location. If the online system 140determines the user associated with the client device 110 is eligible tobe presented with a content item associated with the physical location,the online system 140 provides 355 the content item to the client device110 for presentation to the user, in various embodiments. For example,the online system 140 identifies the polygon formed by each edge of theset of edges based on a polygon identifier stored in association withedge data describing each edge of the set of edges and communicates astored content item associated with the physical location represented bythe polygon to the client device 110 for presentation to the user. Inother embodiments, if the online system 140 determines the userassociated with the client device 110 is eligible to be presented with acontent item associated with the physical location, the content item isincluded in a content selection process and ranked among other contentitems associated with targeting criteria satisfied by the user; thecontent item is provided 255 to the client device 110 for presentationto the user if the content item is selected during the content selectionprocess, as further described above in conjunction with FIG. 2.

In various embodiments, the online system 140 determines the clientdevice 110 is not within an area of the map represented by the polygon410 if the value computed by the online system 140 indicates no edge oran even number of edges of the set of edges is intersected by a ray froma position of the location point along an axis of the map perpendicularto the specified axis. For example, referring to FIG. 9B, the onlinesystem 140 traces a ray 910 from the location point 800B along an axisof the map perpendicular to the specified axis and determines the clientdevice 110 is not within an area of the map represented by the polygon410 since two edges of the set 815 of edges 810A, C are intersected bythe ray 910. As illustrated in this example, a ray 910 from the locationpoint 800B intersecting an even number of edges of the polygon 410 alongan axis of the map perpendicular to the specified axis indicates thelocation point 800B is outside an area of the map bound by the edges ofthe polygon 410. If the computed value is associated with a set of edgesincluding edges of more than one polygon, the online system 140determines the client device 110 is not within an area of the maprepresented by a particular polygon if the value indicates no edges oran even number of edges of the particular polygon are intersected by theray, in some embodiments. For example, the online system 140 identifiesa particular polygon having an even number of edges intersected by theray based on a polygon identifier associated with the even number ofedges.

If the client device 110 is determined to be not within an area of themap represented by the polygon 410, the online system 140 determines 350the client device 110 is not at the physical location. The online system140 then determines 370 whether the client device 110 is within at leasta threshold distance of the physical location. In various embodiments,the threshold distance is specified by a publishing user who providedthe online system 140 with the content item and information describingthe physical location. For example, if the online system 140 receives300 targeting criteria associated with the content item specifyingonline system users determined to be within 100 yards from the physicallocation are eligible to receive the content item, the thresholddistance is 100 yards.

To determine 370 whether the client device 110 is within at least thethreshold distance of the physical location, the online system 140determines 360 a location boundary surrounding a representation of thegeographic location of the client device 110 on the map and compares theposition of the location boundary and a position of an edge boundarysurrounding each edge of the polygon 410 on the map. In variousembodiments, the location boundary comprises a radius around arepresentation of the geographic location of the client device 110 onthe map corresponding to the threshold distance. For example, referringto FIG. 10A, if the threshold distance is 50 meters, the online system140 determines 360 a location boundary 1000 associated with thegeographic location of the client device that includes a geographic areahaving a radius of 50 meters around a representation 1010 of thegeographic location of the client device 110 on the map. In someembodiments, the location boundary 1000 comprises a set of locationboundary coordinates which identifies a plurality of points along ageometric perimeter surrounding a representation 1010 of the geographiclocation of the client device 110 on the map. For example, to determine360 the location boundary 1000, the online system 140 determines 360 aset of location boundary coordinates identifying multiple points on themap comprising a radius around a representation 1010 of the geographiclocation of the client device 110 on the map corresponding to thethreshold distance.

In various embodiments, the online system 140 compares 365 the positionof the location boundary and a position of an edge boundary surroundingeach edge of the polygon 410 on the map to determine whether thelocation boundary intersects at least one edge boundary. For example,the online system 140 queries the edge data store 250 for edge boundarycoordinates stored in association with each edge of the polygon 410 anddetermines whether the location boundary intersects at least one edgeboundary based on the returned edge boundary coordinates. The onlinesystem 140 determines the location boundary intersects an edge boundaryif a set of location boundary coordinates comprising the locationboundary identify a point on the map also identified by a set of edgeboundary coordinates comprising edge boundaries determined 320 by theonline system 140, in some embodiments. For example, referring to FIG.10B, if both the location boundary 1000 and an edge boundary include apoint 1020A-C on the map identified by the same x,y coordinate, theonline system 140 determines the location boundary 1000B intersects theedge boundary. In this example, the online system 140 determines thelocation boundary 1000B intersects three edge boundaries at three points1020A-C on the map.

In various embodiments, if the online system 140 determines the locationboundary intersects at least one edge boundary, the client device 110 isdetermined 370 to be within at least the threshold distance of thephysical location associated with the content item. For example,referring again to FIG. 10B, the online system 140 determines 370 theclient device 110 is within at least the threshold distance of thephysical location 1010 since the location boundary 1000 intersects atleast one edge boundary. Hence, based on the comparison of the positionof the location boundary 1000 and edge boundaries surrounding edges ofthe polygon 410, the online system 140 determines 370 whether the clientdevice 110 is within at least the threshold distance of the physicallocation.

If the client device 110 is determined 370 to be within the thresholddistance of the physical location, the online system 140 determines theuser associated with the client device 110 is visiting an area withinthe threshold distance of the physical location and is thereforeeligible to be presented with a content item associated with thephysical location. If the online system 140 determines the userassociated with the client device 110 is eligible to be presented with acontent item associated with the physical location, the online system110 provides 355 the content item to the client device 110 forpresentation to the user, in various embodiments. For example, theonline system 140 identifies a polygon formed by an edge circumscribedby an edge boundary intersecting the location boundary and communicatesa content item associated with the physical location represented by thepolygon to the client device 110 for presentation to the user. In thisexample, the online system 140 identifies the polygon 410 based on apolygon identifier stored in association with the edge boundary andretrieves a stored content item associated with the physical locationfor presentation.

In other embodiments, if the online system 140 determines the userassociated with the client device is eligible to be presented with acontent item associated with the physical location, the content item isincluded in a content selection process and ranked among other contentitems associated with targeting criteria satisfied by the user. Asfurther described above in conjunction with FIG. 2, the content item isprovided 355 to the client device 110 for presentation to the user ifthe content item is selected during the content selection process.Hence, the online system 140 determines whether the user is eligible toreceive the content item when the user is at or within the specifieddistance of the physical location based on the stored informationdescribing the polygon 410 representing the physical location and thelocation information received 330 from the user's client device 110.

SUMMARY

The foregoing description of the embodiments has been presented for thepurpose of illustration; it is not intended to be exhaustive or to limitthe patent rights to the precise forms disclosed. Persons skilled in therelevant art can appreciate that many modifications and variations arepossible in light of the above disclosure.

Some portions of this description describe the embodiments in terms ofalgorithms and symbolic representations of operations on information.These algorithmic descriptions and representations are commonly used bythose skilled in the data processing arts to convey the substance oftheir work effectively to others skilled in the art. These operations,while described functionally, computationally, or logically, areunderstood to be implemented by computer programs or equivalentelectrical circuits, microcode, or the like. Furthermore, it has alsoproven convenient at times, to refer to these arrangements of operationsas modules, without loss of generality. The described operations andtheir associated modules may be embodied in software, firmware,hardware, or any combinations thereof.

Any of the steps, operations, or processes described herein may beperformed or implemented with one or more hardware or software modules,alone or in combination with other devices. In one embodiment, asoftware module is implemented with a computer program productcomprising a computer-readable medium containing computer program code,which can be executed by a computer processor for performing any or allof the steps, operations, or processes described.

Embodiments may also relate to an apparatus for performing theoperations herein. This apparatus may be specially constructed for therequired purposes, and/or it may comprise a general-purpose computingdevice selectively activated or reconfigured by a computer programstored in the computer. Such a computer program may be stored in anontransitory, tangible computer readable storage medium, or any type ofmedia suitable for storing electronic instructions, which may be coupledto a computer system bus. Furthermore, any computing systems referred toin the specification may include a single processor or may bearchitectures employing multiple processor designs for increasedcomputing capability.

Embodiments may also relate to a product that is produced by a computingprocess described herein. Such a product may comprise informationresulting from a computing process, where the information is stored on anontransitory, tangible computer readable storage medium and may includeany embodiment of a computer program product or other data combinationdescribed herein.

Finally, the language used in the specification has been principallyselected for readability and instructional purposes, and it may not havebeen selected to delineate or circumscribe the patent rights. It istherefore intended that the scope of the patent rights be limited not bythis detailed description, but rather by any claims that issue on anapplication based hereon. Accordingly, the disclosure of the embodimentsis intended to be illustrative, but not limiting, of the scope of thepatent rights, which is set forth in the following claims.

What is claimed is:
 1. A method comprising: determining a polygon havinga plurality of edges bounding a representation of a physical location ona map, the physical location associated with a content item maintainedby an online system; for each edge of the plurality of edges,determining edge data describing a position of the edge on the map, theedge data comprising a plurality of edge coordinates representing aplurality of points of the edge on the map, generating an indexcomprising a set of edge coordinates representing a position of eachendpoint of the edge along a specified axis of the map, and storing theedge data and index into an edge data store with an identifierassociated with the polygon; receiving, from a client device associatedwith a user of the online system, location information describing ageographic location of the client device; determining a location pointrepresenting a position of the geographic location on the specified axisof the map based on the location information; retrieving, from the edgedata store, information about a set of edges of the polygon that spanthe location point along the specified axis of the map, the retrievingcomprising querying the edge data store using a set of indexed edgecoordinates; determining whether the client device is at the physicallocation based at least in part on the set of edges; and responsive todetermining the client device is at the physical location, providing thecontent item to the client device for presentation to the user.
 2. Themethod of claim 1, wherein querying the edge data store using a set ofindexed edge coordinates comprises identifying an edge associated with aplurality of edge coordinates representing a position of each endpointof the edge on opposite sides of the location point along the specifiedaxis of the map.
 3. The method of claim 1, wherein determining whetherthe client device is at the physical location based at least in part onthe set of edges comprises: comparing a position of the location pointon an additional axis of the map perpendicular to the specified axis anda position of each edge of the set of edges on the additional axis ofthe map; and determining the client device is at the physical locationif an odd number of edges of the set of edges includes a point on oneside of the location point on the additional axis of the mapperpendicular to the specified axis.
 4. The method of claim 1, furthercomprising: computing a number of edges of the set of edges intersectedby a ray from a position of the geographic location on the map along anaxis of the map perpendicular to the specified axis; and determining theclient device is at the physical location if an odd number of edges ofthe set of edges are intersected by the ray.
 5. The method of claim 4,further comprising determining the client device is not at the physicallocation if an even number of edges of the set of edges are intersectedby the ray or no edge of the set of edges is intersected by the ray. 6.The method of claim 1, further comprising: responsive to determining theclient device is not at the physical location, determining whether theclient device is within at least a threshold distance of the physicallocation based at least in part on a proximity of a representation ofthe geographic location on the map to an edge of the plurality of edges;and responsive to determining the client device is within at least thethreshold distance of the physical location, providing the content itemto the client device for presentation to the user.
 7. The method ofclaim 6, wherein determining whether the client device is within atleast the threshold distance of the physical location comprises:determining a location boundary surrounding the representation of thegeographic location on the map, the location boundary comprising an areaon the map corresponding to a geographic area having a specified radiusaround the geographic location; determining whether the locationboundary intersects an edge boundary on the map; and responsive todetermining the location boundary intersects the edge boundary,determining the client device is within at least the threshold distanceof the physical location.
 8. The method of claim 1, wherein the physicallocation is selected from a group consisting of: a building, a streetaddress, a set of geographic coordinates, a neighborhood, a landmark,and any combination thereof.
 9. A method comprising: receiving, from aclient device associated with a user of an online system, locationinformation describing a geographic location of the client device;determining a location point representing a position of the geographiclocation on a specified axis of the map based on the locationinformation; retrieving stored edge data associated with one or morepolygons representing one or more physical locations on the map, thestored edge data describing a position of each edge of the one or morepolygons along the specified axis of the map; identifying a set of edgeshaving a position on the specified axis of the map including thelocation point; computing a value associated with the set of edges basedat least in part on a number of edges of the set of edges associatedwith a polygon of the one or more polygons; and determining whether theclient device is at a physical location represented by the polygon basedat least in part on the value associated with the set of edges.
 10. Themethod of claim 9, further comprising responsive to determining theclient device is at the physical location, providing a content itemassociated with the physical location to the client device forpresentation to the user.
 11. The method of claim 9, further comprisingdetermining the client device is at the physical location if a ray froma position of the geographic location on the map along an axisperpendicular to the specified axis of the map intersects an odd numberof edges of the polygon on the map.
 12. The method of claim 9, furthercomprising determining the client device is not at the physical locationif a ray from a position of the geographic location on the map along anaxis perpendicular to the specified axis of the map intersects an evennumber of edges of the polygon on the map.
 13. The method of claim 9,further comprising determining the client device is not at the physicallocation if a ray from a position of the geographic location on the mapalong an axis perpendicular to the specified axis of the map does notintersect an edge of the polygon on the map.
 14. The method of claim 9,further comprising: responsive to determining the client device is notat the physical location, determining whether the client device iswithin at least a threshold distance of the physical location based atleast in part on a proximity of a representation of the geographiclocation on the map to an edge of the polygon; and responsive todetermining the client device is within at least the threshold distanceof the physical location, providing a content item associated with thephysical location to the client device for presentation to the user. 15.The method of claim 14, wherein determining whether the client device iswithin at least the threshold distance of the physical locationcomprises: determining a location boundary surrounding a representationof the geographic location on the map, the location boundary comprisingan area on the map corresponding to a geographic area having a specifiedradius around the geographic location; determining whether the locationboundary intersects an edge boundary of an edge of the polygon on themap; and responsive to determining the location boundary intersects theedge boundary, determining the client device is within at least thethreshold distance of the physical location.
 16. A computer programproduct comprising a computer readable storage medium havinginstructions encoded thereon that, when executed by a processor, causethe processor to: determine a polygon having a plurality of edgesbounding a representation of a physical location on a map, the physicallocation associated with a content item maintained by an online system;for each edge of the plurality of edges, determine edge data describinga position of the edge on the map, the edge data comprising a pluralityof edge coordinates representing a plurality of points of the edge onthe map, generate an index comprising a set of edge coordinatesrepresenting a position of each endpoint of the edge along a specifiedaxis of the map, and store the edge data and index into an edge datastore with an identifier associated with the polygon; receive, from aclient device associated with a user of the online system, locationinformation describing a geographic location of the client device;determine a location point representing a position of the geographiclocation on the specified axis of the map based on the locationinformation; retrieve, from the edge data store, information about a setof edges of the polygon that span the location point along the specifiedaxis of the map, the retrieval comprising querying the edge data storeusing a set of indexed edge coordinates; determine whether the clientdevice is at the physical location based at least in part on the set ofedges; and responsive to determining the client device is at thephysical location, provide the content item to the client device forpresentation to the user.
 17. The computer program product of claim 16,wherein querying the edge data store using a set of indexed edgecoordinates comprises identifying an edge associated with a plurality ofedge coordinates representing a position of each endpoint of the edge onopposite sides of the location point along the specified axis of themap.
 18. The computer program product of claim 16, wherein determinewhether the client device is at the physical location based at least inpart on the set of edges comprises: compare a position of the locationpoint on an additional axis of the map perpendicular to the specifiedaxis and a position of each edge of the set of edges on the additionalaxis of the map; and determine the client device is at the physicallocation if an odd number of edges of the set of edges includes a pointon one side of the location point on the additional axis of the mapperpendicular to the specified axis.
 19. The computer program product ofclaim 16, wherein the computer readable storage medium further hasinstructions encoded thereon that, when executed by the processor, causethe processor to: compute a number of edges of the set of edgesintersected by a ray from a position of the geographic location on themap along an axis of the map perpendicular to the specified axis; anddetermine the client device is at the physical location if an odd numberof edges of the set of edges are intersected by the ray.
 20. Thecomputer program product of claim 19, wherein the computer readablestorage medium further has instructions encoded thereon that, whenexecuted by the processor, cause the processor to determine the clientdevice is not at the physical location if an even number of edges of theset of edges are intersected by the ray or no edge of the set of edgesis intersected by the ray.
 21. The computer program product of claim 16,wherein the computer readable storage medium further has instructionsencoded thereon that, when executed by the processor, cause theprocessor to: responsive to determining the client device is not at thephysical location, determine whether the client device is within atleast a threshold distance of the physical location based at least inpart on a proximity of a representation of the geographic location onthe map to an edge of the plurality of edges; and responsive todetermining the client device is within at least the threshold distanceof the physical location, provide the content item to the client devicefor presentation to the user.
 22. The computer program product of claim21, wherein determine whether the client device is within at least thethreshold distance of the physical location comprises: determine alocation boundary surrounding the representation of the geographiclocation on the map, the location boundary comprising an area on the mapcorresponding to a geographic area having a specified radius around thegeographic location; determine whether the location boundary intersectsan edge boundary on the map; and responsive to determining the locationboundary intersects the edge boundary, determine the client device iswithin at least the threshold distance of the physical location.
 23. Thecomputer program product of claim 16, wherein the physical location isselected from a group consisting of: a building, a street address, a setof geographic coordinates, a neighborhood, a landmark, and anycombination thereof.